I posted this on the other thread where this issue is being discussed, here's the update:

Multisim Touch Crash Update

We have some updates for everyone who has had experienced the crash in Multisim Touch, I will split the news on whether you are running or can run iOS 9, and for those who want to maintain the older versions of iOS (e.g. 8.x or 7.x).

If you have iOS 9 or will update to iOS 9

For these users, the app should not be crashing at all, the app works fine in iOS 9 to the best of our knowledge. On any case, you will see a 1.1.3 version update in the App Store, feel free to apply that update. If you have an older version of iOS (e.g. 8.x) and the app is crashing, once you update your iOS the app will work fine, in case it doesn't just uninstall and reinstall.

If you have iOS 8.x or lower and will not update to iOS 9

If you are not interested in using the latest iOS version, and wish to keep your older version of iOS, we will ask you to uninstall the app from your iPad, then go back to your App Store account and download the app again, you will receive a message saying that your iOS is not compatible with the latest version of the app, however it will allow you to install the working version of the app that is marked with a different build (1.1.0). Once you do this, the app should work fine.

What am I missing by using 1.1.0 vs. 1.1.3?

In reality you are not missing any functionality, our 1.1.1 update was a code migration to support iOS 9 and 64-bit requirements set by Apple, and the resulting bug fixes from that migration. 1.1.2 was also a batch of bug fixes for the same code migration.

If the above procedure does not works and you still experience the crash, please update us in this forum post or open a new one (preferable).